Fastener tape

ABSTRACT

This fastener tape includes a first belt-shaped member and a second belt-shaped member that are engageable with each other, the first and second belt-shaped members being constituted with a resin composition containing an ethylene-vinyl alcohol copolymer and an acid-modified polyolefin resin.

FIELD

The present invention relates to a fastener tape (zipper tape).

BACKGROUND

Packaging bags provided with fastener tape are widely used as a means ofsealing contents such as food. Packaging bags with fastener tape areuseful since they can be resealed after having been opened.

The product value of contents enclosed in a packaging bag with fastenertape are influenced by volatile components such as aromatic componentscontained therein. In such cases, the packaging bag with fastener tapeis required to not adsorb these components. Various means have beenproposed to satisfy this requirement.

PTL1 discloses a fastener tape comprised of an ethylene-vinyl alcoholcopolymer and a packaging bag having a fastener tape comprising anethylene-vinyl alcohol copolymer layer for the innermost layer and anethylene-vinyl alcohol copolymer for the opening.

PTL2 discloses a fastener tape joined to the inner surface of apackaging bag having a plastic innermost layer, wherein the fastenertape is provided with a pair of plastic linear members having astrip-like interlocking engageable structure and a pair of plasticstrip-like sheets in which this pair of linear members is attached inthe lengthwise direction on opposing surfaces, and the strip-like sheetsare provided with a substrate film capable of joining with the innersurface of the packaging bag and a first fusing resin layer formed overthe entire surface on the side opposing this substrate film.

CITATION LIST Patent Literature

PTL1: JP H3-289401 A

PTL2: JP 2012-158378 A

SUMMARY Technical Problem

Although ethylene-vinyl alcohol copolymers have superior non-adsorbency,they have the shortcomings of inadequate flexibility and heatsealability. Thus, in the case of fabricating a fastener tape made of anethylene-vinyl alcohol copolymer and a packaging bag with fastener tapeusing a film made of an ethylene-vinyl alcohol copolymer as in PTL1,although non-adsorbency is obtained, the packaging bag cannot be openedeasily due to inadequate flexibility. In this packaging bag withfastener tape, as a result of being unable to obtain adequate heatsealability between the fastener tape and film, the fused portionbetween the fastener tape and film is unable to withstand the engagingstrength of the fastener tape, thereby causing the fastener tape todetach when opening.

Even in the case of using the fastener tape described in PTL2 byadhering to a packaging bag made of an ethylene-vinyl alcohol copolymer,since the fastener tape portion lacks non-adsorbency, adequatenon-adsorbency is unable to be obtained for the entire packaging bag.

Therefore, there is a need to provide a fastener tape that can be fusedwith adequate strength to a non-adsorbent packaging bag, isnon-adsorbent with respect to aromatic components, and is able todemonstrate favorable openability.

Solution to Problem

As a result of conducting extensive studies, the inventors of thepresent invention found that the aforementioned problems can be solvedby the means indicated below, thereby leading to completion of thepresent invention. Namely, the present invention is as indicated below.

<Aspect 1>

A fastener tape comprised of first and second strip-like members thatcan be mutually engaged: wherein

the first and second strip-like members are composed with a resincomposition containing an ethylene-vinyl alcohol copolymer and anacid-modified polyolefin-based resin.

<Aspect 2>

The fastener tape according to Aspect 1, wherein the resin compositioncontains 65-95 mass % of an ethylene-vinyl alcohol copolymer and 5-35mass % of an acid-modified polyolefin-based resin.

<Aspect 3>

The fastener tape according to Aspect 1 or 2, wherein the content ofethylene monomer unit in the ethylene-vinyl alcohol copolymer is 10-70mol % based on the total number of moles of the ethylene monomer unitand vinyl alcohol monomer unit in the entire ethylene-vinyl alcoholcopolymer.

<Aspect 4>

The fastener tape according to any one of Aspects 1 to 3, wherein themelt mass flow rate of the resin composition as determined in compliancewith JIS K7210-1 is 1.0 g/10 min or more under conditions of atemperature of 260° C. and load of 21.18 N.

<Aspect 5>

The fastener tape according to any one of Aspects 1 to 4, wherein whenthe resin composition is molded into a film, cut to a size of 10 cm×10cm, one surface is exposed for one week to L-menthol vapor in anenvironment at 40° C., the adsorbed L-menthol is extracted with methylethyl ketone, and the amount of L-menthol in the extract is quantifiedby gas chromatography, the adsorbed amount of L-menthol in the film is0.7 mg or less.

<Aspect 6>

A packaging bag with fastener tape provided with:

a packaging bag composed with a packaging bag film provided with anon-adsorbent layer, containing an ethylene-vinyl alcohol copolymer, forthe innermost layer, and

the fastener tape according to any one of Aspects 1 to 5 fused to thenon-adsorbent layer so that the first and second strip-like members aremutually opposing.

<Aspect 7>

A method for producing a packaging bag with fastener tape using:

a fastener tape comprised of first and second strip-like members thatcan be mutually engaged, wherein the first and second strip-like membersare composed with a resin composition containing an ethylene-vinylalcohol copolymer and an acid-modified polyolefin-based resin, and

a packaging bag film provided with a non-adsorbent layer containing anethylene-vinyl alcohol copolymer, the method including:

fusing the fastener tape to the non-adsorbent layer, and

fusing the ends of the non-adsorbent layer by mutually opposing to forma bag such that the first and second strip-like members of the fastenertape are mutually opposing: wherein,

when forming a bag by fusing the ends of the non-adsorbent layer bymutually opposing, at least a portion of the fastener tape is integrallyfused and collapsed together with the ends of the non-adsorbent layerbetween the mutually opposing ends of the non-adsorbent layer.

Advantageous Effects of Invention

According to the present invention, a fastener tape can be provided, thefastener tape being able to be fused with adequate strength to anon-adsorbent packaging bag, being non-adsorbent with respect toaromatic components, and being able to demonstrate favorableopenability.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 depicts drawings indicating one aspect of the fastener tape ofthe present invention.

FIG. 2 depicts drawings indicating one aspect of a packaging bag withfastener tape of the present invention.

FIG. 3 depicts drawings indicating each step of one aspect of the methodof the present invention for manufacturing a packaging bag with fastenertape.

DESCRIPTION OF EMBODIMENTS

<<Fastener Tape>>

As shown in FIG. 1, the fastener tape 100 of the present invention is afastener tape comprised of a first strip-like member 10 and a secondstrip-like member 20 that can be mutually engaged. In one aspect of thefastener tape of the present invention, the first strip-like member 10has an engageable portion 12 and the second strip-like member 20 has anengageable portion 22.

The first and second strip-like members are composed with a resincomposition containing an ethylene-vinyl alcohol copolymer (EVOH) and anacid-modified polyolefin-based resin.

According to the aforementioned composition, a fastener tape can beprovided, the fastener tape being able to be fused with adequatestrength to a non-adsorbent packaging bag, and particularly a packagingbag provided with a layer containing an ethylene-vinyl alcohol copolymerfor the innermost layer thereof, being non-adsorbent with respect to anaromatic component, and demonstrating favorable flexibility aftermolding as a result of having suitable flexibility.

Examples of aromatic components include menthol, limonene, methylsalicylate, camphor and tocopherol, etc.

The following provides an explanation of each constituent of the presentinvention.

<First and Second Strip-Like Members>

The first and second strip-like members are a pair of members that canbe mutually engaged. The first and second strip-like members arecomposed with the resin composition described below.

As shown in FIG. 1, for example, the first strip-like member 10 and thesecond strip-like member 20 respectively have the engageable portion 12and the engageable portion 22. In this aspect, the surface of theengageable portion 12 of the first strip-like member 10 and the surfaceof the engageable portion 22 of the second strip-like member 20 are eachsurfaces that fuse with the packaging bag.

(Resin Composition)

The resin composition composing the first and second strip-like memberscontains EVOH and an acid-modified polyolefin-based resin.

The content of EVOH can be 60 mass %6 or more, 65 mass % or more, 70mass % or more, 75 mass % or more, 80 mass % or more or 82 mass % ormore, and 95 mass % or less, 93 mass % or less or 90 mass % or less.This content being 65 mass % or more, 70 mass % or more, 75 mass % ormore, 80 mass % or more or 82 mass % or more and 90 mass % or less ispreferable from the viewpoint of realizing both favorable heat sealingstrength with the non-adsorbent packaging bag and favorablenon-adsorbency.

The content of the acid-modified polyolefin-based resin can be 5 mass %or more, 7 mass % or more or 10 mass % or more, and 40 mass % or less,35 mass % or less, 30 mass % or less, 25 mass % or less, 20 mass % orless or 18 mass % or less. This content being 10 mass % or more and 35mass % or less, 30 mass % or less, 25 mass % or less, 20 mass % or lessor 18 mass % or less is preferable from the viewpoint of realizing bothfavorable heat sealing strength with the non-adsorbent packaging bag andfavorable non-adsorbency. As a result of having the aforementionedcontent, suitable flexibility can be imparted to the resin and favorableopenability can be demonstrated when molded into a fastener tape,thereby making this preferable.

The melt mass flow rate of the resin composition as determined incompliance with JIS K7210-1 being 1.0 g/10 min or more under conditionsof a temperature of 260° C. and load of 21.18 N is preferable from theviewpoint of enabling at least a portion of the fastener tape to beintegrally fused and collapsed between the mutually opposing ends of theinnermost layer of the packaging bag, and particularly between themutually opposing ends of a non-adsorbent layer of a non-adsorbentpackaging bag, thereby resulting in favorable sealing performance of thepackaging bag. This melt mass flow rate can be 1.0 g/10 min or more, 2.0g/10 min or more or 3.0 g/10 min or more and 100 g/10 min or less, 80g/10 min or less, 60 g/10 min or less, 50 g/10 min or less, 40 g/10 minor less, 30 g/10 min or less, 25 g/10 min or less, 20 g/10 min or less,15 g/10 min or less or 10 g/10 min or less.

This MFR may be determined by directly measuring the weight of anextrudate extruded for 10 minutes in compliance with Method A of JISK7210-1, or by measuring the volume of an extrudate extruded for 10minutes followed by calculating the weight of the extrudate using thedensity of the extrudate in compliance with Method B.

The resin composition having the aforementioned composition can havehigh non-adsorbency. More specifically, when this resin composition ismolded into a film, cut to a size of 10 cm×10 cm, one surface is exposedfor one week to L-menthol vapor in an environment at 40° C., theadsorbed L-menthol is extracted with methyl ethyl ketone, and the amountof adsorbed L-menthol in the extract is quantified by gaschromatography, the adsorbed amount of L-menthol in this film can be 0.7mg or less. This adsorbed amount of L-menthol can be 0.6 mg or less, 0.5mg or less, 0.4 mg or less, 0.3 mg or less or 0.2 mg or less and 0 mg ormore, 0.001 mg or more, 0.005 mg or more, 0.010 mg or more or 0.020 mgor more.

(Resin Composition: Ethylene-Vinyl Alcohol Copolymer (EVOH))

EVOH can be generally be obtained by saponifying an ethylene-vinyl estercopolymer. EVOH makes it possible to provide the fastener tape withnon-adsorbency with respect to aromatic components.

The content of ethylene monomer unit in the EVOH can be 10 mol % ormore, 15 mol % or more, 20 mol % or more, 25 mol % or more, 30 mol % ormore or 35 mol % or more and 70 mol % or less, 60 mol % or less, 55 mol% or less, 50 mol % or less or 45 mol % or less based on the totalnumber of moles of ethylene monomer unit and vinyl alcohol monomer unitin the entire EVOH.

EVOH can be generally be obtained by saponifying an ethyl-vinyl estercopolymer. In this case, the degree of saponification of the vinyl esterunit of the EVOH can be 90 mol % or more, 95 mol % or more, 99 mol % ormore or 100 mol %. If the degree of saponification is high,crystallization occurs easily, gas impermeability increases and thermalstability during melting improves. Thus, a higher degree ofsaponification is generally preferable.

A typical example of a vinyl ester is vinyl acetate and other examplesinclude vinyl esters such as vinyl propionate, vinyl pivalate, vinylvalerate, vinyl caprate and vinyl benzoate. One type of these vinylesters may be used or two or more types may be used as a mixture.

A mixture of EVOH, for which at least one of ethylene content, degree ofsaponification and degree of polymerization differ, may be used as EVOH.The EVOH may contain other copolymer components within a range that doesnot impair the object of the present invention. A plurality of types ofthese EVOH may be used in combination.

(Resin Composition: Acid-Modified Polyolefin-Based Resin)

The acid-modified polyolefin-based resin can be obtained by graftpolymerization of an acid to a polyolefin. The acid-modifiedpolyolefin-based resin is able to impart the fastener tape withfusibility to the packaging bag. Maleic anhydride-modified polyolefin,for example, is used for the acid-modified polyolefin-based resin.

Polyethylene (including low density polyethylene (LDPE), linear lowdensity polyethylene (LLDPE), ultra-low density polyethylene (ULDPE),medium density polyethylene and high density polyethylene (HDPE) orpolypropylene (including polypropylene (PP), homopolymer polypropylene(homo PP), random polypropylene (random PP) and block polypropylene(block PP) is preferably used as the polyolefin.

A plurality of types of acid-modified polyolefin-based resin may be usedin combination.

For example, maleic anhydride-modified polyolefin obtained by graftpolymerizing 0.05 mass parts or more, 0.1 mass parts or more, 0.3 massparts or more, 0.5 mass parts or more or 1.0 mass part or more and 50mass parts or less, 30 mass parts or less, 20 mass parts or less, 10mass parts or less or 5.0 mass parts or less of maleic anhydride to 100mass parts of polyolefin can be used for the maleic anhydride-modifiedpolyolefin. Examples of this maleic anhydride-modified polyolefin aredescribed in JP H9-278956 A.

<<Packaging Bag with Fastener Tape>>

The packaging bag with fastener tape is provided with a packaging bag,provided with a non-adsorbent layer containing an ethylene-vinyl alcoholcopolymer as the innermost layer thereof, and the aforementionedfastener tape fused to the non-adsorbent layer of the packaging bag suchthat first and second strip-like members are mutually opposed.

The packaging bag with fastener tape having the aforementionedcomposition is able to demonstrate favorable non-adsorbency as a wholepackaging bag since both non-adsorbency of the fastener tape andnon-adsorbency of the packaging bag can be realized.

<Packaging Bag>

The packaging bag is provided with a non-adsorbent layer containing anethylene-vinyl alcohol copolymer as the innermost layer.

This packaging bag is composed with a packaging bag film at leastprovided with a non-adsorbent layer. This packaging bag film may alsofurther be provided with an optional substrate layer.

(Non-Adsorbent Layer)

The non-adsorbent layer contains an ethylene-vinyl alcohol copolymer. Anethylene-vinyl alcohol copolymer listed as an example relating to thefastener tape can be used for the ethylene-vinyl alcohol copolymer.

The non-adsorbent layer further containing an acid-modifiedpolyolefin-based resin is preferable from the viewpoint of resulting inmore preferable fusibility with the fastener tape. An acid-modifiedpolyolefin-based resin listed as an example relating to the fastenertape can be used for the acid-modified polyolefin-based resin.

(Substrate Layer)

The substrate layer is laminated onto the non-adsorbent layer in thepackaging bag film. This substrate layer imparts suitable stiffness tothe non-adsorbent layer and impermeability that prevents the entrance ofmoisture or chlorine and the like from the outside, thereby making thispreferable.

A substrate layer made from polyolefin, polyvinyl chloride,polyvinylidene chloride, polychlorotrifluoroethylene,polytetrafluoroethylene, saturated or unsaturated polyester (such aspolyethylene terephthalate (PET) or polybutylene terephthalate),polyamide, polyacrylonitrile or a combination thereof can be used asthis substrate layer. A substrate layer made from these materials may beused as a single layer or laminated. A barrier layer such as purealuminum foil, aluminum alloy foil or an alumina or silica depositedfilm may also be laminated for the purpose of enhancing impermeability.

(Other Layers)

The packaging bag film may also optionally have other layers. An exampleof other layers includes adhesive layers present between each layer.

<<Method for Producing Packaging Bag with Fastener Tape>>

The method of the present invention for producing a packaging bag withfastener tape includes a fusion step for fusing the aforementionedfastener tape to the non-adsorbent layer of the aforementioned packagingbag film, and a bag formation step for forming a bag by mutuallyopposing and fusing the ends of the non-adsorbent layer such that thefirst and second strip-like members of the fastener tape are mutuallyopposed.

When forming into a bag by mutually opposing and fusing the ends of thenon-adsorbent layer, at least a portion of the fastener tape isintegrally fused and collapsed together with the ends of thenon-absorbent layer between the mutually opposing ends of thenon-adsorbent layer.

The following provides an explanation of each step of the method of thepresent invention for producing a packaging bag with fastener tape withreference to FIG. 3. Although an aspect in which the packaging bag is abag that is sealed on three sides is described in FIG. 3, the packagingbag may be that which is sealed on four sides.

(Fusion Step)

The fusion step is a step for fusing the aforementioned fastener tape tothe non-adsorbent layer of the aforementioned packaging bag film.

This step can be carried out by, for example, preparing a packaging bagfilm provided with a non-adsorbent layer 200 as shown in FIG. 3(a),followed by fusing the first strip-like member 10 and the secondstrip-like member 20 to the non-adsorbent layer 200 of the packaging bagfilm as shown in FIG. 3(b).

Fusion of the fastener tape may be carried out separately from moldingof the fastener tape or may be carried out simultaneous to molding ofthe fastener tape. In the case of attempting to fabricate a packagingbag that is sealed on four sides in particular, the first and secondstrip-like members may each be fused to different packaging bag films.

(Bag Formation Step)

The bag formation step is a step for forming a bag by mutually opposingand fusing the ends of the non-adsorbent layer such that the first andsecond strip-like members of the fastener tape are mutually opposed.

This step can be carried out by, for example, mutually opposing the endsof the non-adsorbent layer 200 such that the first strip-like member 10and the second strip-like member 20 of the fastener tape 100 aremutually opposed, and particularly such that the first strip-like member10 and the second strip-like member 20 mutually engage as shown in FIG.3(c), and forming a bag by fusing the ends of the non-adsorbent layer200 at a sealing portion 250 as shown in FIG. 3(d). When forming a bagby opposing and fusing the ends of the non-adsorbent layer 200, forexample, a portion of the fastener tape 100 at a region 150 where thefastener tape 100 overlaps with the ends can be integrally fused andcollapsed together with the ends of the non-adsorbent layer 200 betweenthe mutually opposing ends of the non-adsorbent layer 200.

EXAMPLES

Although the following provides a detailed explanation of the presentinvention using examples and comparative examples, the present inventionis not limited thereto.

Production of Resin Composition Example 1

The resin composition of Example 1 was prepared by melt kneading EVOH(EVAL, sold by Kuraray, ethylene monomer unit content: 44 mol %) andmaleic anhydride-modified polyolefin (ADMER, sold by Mitsui Chemicals)with a high shear twin screw extruder at a weight ratio of 88:12.

Examples 2 to 4 and Comparative Example 1

The resin compositions of Examples 2 to 4 and Comparative Example 1 wereprepared in the same manner as Example 1 with the exception of changingthe weight ratio of the EVOH and maleic anhydride-modified polyolefin asshown in Table 1.

Examples 5 to 8 and Comparative Example 2

The resin compositions of Examples 5 to 8 and Comparative Example 2 wererespectively prepared in the same manner as Examples 1 to 4 andComparative Example 1 with the exception of using EVOH having anethylene monomer unit content of 48 mol % (EVAL, sold by Kuraray)instead of EVOH having an ethylene monomer unit content of 44 mol %.

Comparative Example 3

The resin composition of Comparative Example 3 was prepared in the samemanner as Example 1 with the exception of using low density polyethyleneinstead of EVOH and maleic anhydride-modified polyolefin.

Evaluation of Properties of Resin Compositions

<Melt Mass Flow Rate>

The melt mass flow rates (MFR) of the prepared resin compositions ofExamples 1 to 8 and Comparative Examples 1 to 3 determined in compliancewith Method A of JIS K7210-1 were measured under conditions of atemperature of 260° C. and load of 21.18 N.

<Tensile Modulus>

Evaluation films having a thickness of 100 μm were formed with a singlelayer film forming machine using the prepared resin compositions.

The formed evaluation films were cut to a width of 15 mm followed bymeasurement of tensile modulus using a tensile tester under conditionsof a tensile speed of 300 mm/min.

<Sealing Strength>

Evaluation films were first formed as explained in relation toevaluation of tensile modulus.

The evaluation films formed in the manner described above were heatsealed under conditions of 160° C., 0.2 MPa and 0.5 sec on the side ofthe non-adsorbent layer of a packaging bag film provided with anon-adsorbent layer, aluminum foil as a substrate layer and PET film inthat order (Non-catch, sold by Kyodo Printing).

Next, the heat-sealed evaluation films and packaging bag film were cutto a width of 15 mm followed by measurement of heat sealing strength bya T peel test using a tensile tester under conditions of a tensile speedof 300 mm/min.

<Adsorbed Amount of L-Menthol>

Evaluation films were first formed as explained in relation toevaluation of tensile modulus.

The evaluation films formed in the manner described above were cut to asize of 10 cm×10 cm, placed in a covered Petri dish having a diameter of14 cm and depth of 2 cm together with 1 g of L-menthol and exposed toL-menthol vapor (3.25 mg/cm³) for 1 week in an atmosphere at 40° C.,followed by extracting the L-menthol adsorbed to the film followingexposure with methyl ethyl ketone and calculating the adsorbed amount ofL-menthol by quantifying the amount of L-menthol in the extract solutionby gas chromatography.

<<Evaluation of Fastener Tape>>

Fastener tape having an interlocking engageable structure in which thethickness of the flange portions was about 100 μm at a width of 1.3 cmwas fabricated by profile melt extrusion using the resin compositionprepared in Example 1. Fastener tape was molded into the same form asExample 1 for the other examples and comparative examples. Fastener tapewas able to be molded for each of the samples.

Next, packaging bags measuring 9 cm×17 cm were prepared according to themethod previously described in relation to FIG. 3 using theaforementioned fastener tape and the aforementioned packaging bag filmfollowed by evaluation of the parameters indicated below.

<Appearance>

The appearance of the region on the side of the packaging bag where thefastener tape is collapsed was observed by visual inspection. Theevaluation criteria were as indicated below.

good: Collapsed favorably

bad: Convexed

<Openability>

Evaluation of openability of the prepared fastener bag was carried outby a sensory evaluation. The evaluation criteria were as indicatedbelow.

good: Able to be opened easily

bad: Not able to be opened easily

The results are shown in the following Table 1. With respect to “MFR” inTable 1, a value of “≥220.0” indicates that an accurate value was unableto be measured as a result of MFR having exceeded 20.

TABLE 1 Composition EVOH Packaging Bag Ethylene Acid- CompositionEvaluations Evaluations Monomer Modified PO PE Sealing AdsorbedAppearance Content in Unit Content in Content in MFR Tensile StrengthAmount of Composition Content Composition Composition (g/10 min) Modulus(N/15 mm) (mg/ Collapsed Open- (mass %) (mol %) (mass %) (mass %) 260°C. (N/mm²) 160° C. 100 cm²) Portion ability Ex. 1 88 44 12 — 5.40 835.323.7 0.03 good good Ex. 2 80 44 20 — 3.33 693.1 22.1 0.09 good good Ex.3 70 44 30 — 2.07 529.7 20.1 0.16 good good Ex. 4 60 44 40 — 0.49 413.922.4 0.57 bad good Ex. 5 88 48 12 — ≥20.0 843.2 22.0 0.10 good good Ex.6 80 48 20 — ≥20.0 757.5 20.0 0.17 good good Ex. 7 70 48 30 — ≥20.0597.6 24.1 0.13 good good Ex. 8 60 48 40 — ≥20.0 547.5 24.1 0.22 goodgood Comp. 100 44 — — 11.3 1101.2 16.1 0.02 good bad Ex. 1 Comp. 100 48— — ≥20.0 1230.6 18.0 0.20 good bad Ex. 2 Comp. — — — 100 5.44 281.2(unsealable) 14.3 good good Ex. 3

It can be understood from Table 1 that the fastener tape prepared usingthe resin compositions of Examples 1 to 8 are able to be fused withsufficient strength so as to withstand opening of the packaging bag,have non-adsorbency with respect to aromatic components, and demonstratefavorable openability.

Among these, packaging bags with fastener tape prepared using the resincompositions of Examples 1 to 3 and Example 5 to 8, in which MFR was 1.0or more, can be understood to allow the obtaining of favorablesealability as a result of being able to be favorably collapsed duringbag production.

<Evaluated Values of L-Menthol Adsorption by Packaging Bags withFastener Tape>

The amounts of L-menthol adsorbed for an entire packaging bag withfastener tape of a prescribed size were estimated using the amount ofL-menthol adsorbed by the resin compositions as previously described.

Estimation was carried out by assuming use of the packaging bag withfastener tape indicated below.

Size of portion housing contents: 10 cm×15 cm

Fastener tape: 10 cm long×1.3 cm wide

A region corresponding to a width of 0.65 cm equal to half of the widthof 1.3 cm of the aforementioned fastener tape was assumed to makecontact with the contents of the packaging bag.

The areas of the portion of the fastener tape in the packaging bag andthe region of the non-adsorbent layer of the packaging bag that contactsthe contents were as indicated below.

Fastener tape: 0.65 cm×20 cm=13 cm²

Non-adsorbent layer of packaging bag: 14.35 cm×20 cm=287 cm²

The adsorbed amount of L-menthol for the entire packaging bag wascalculated using the aforementioned values and the adsorbed amount ofL-menthol of the resin composition.

Amount adsorbed by fastener tape (mg)=non-adsorbency of fastener tape(mg/100 cm²)×area of fastener tape portion (cm²)/100

Amount adsorbed by non-adsorbent layer (mg)=non-adsorbency ofnon-adsorbent layer (mg/100 cm²)×area of non-adsorbent layer portion(cm²)/100

Total adsorbed amount (mg)=Amount adsorbed by fastener tape (mg)+amountadsorbed by non-adsorbent layer (mg)

Non-adsorbency of the non-adsorbent layer was evaluated in the samemanner as the aforementioned non-adsorbency of the resin compositions.

The results of the calculations are shown in the following Table 2.

TABLE 2 Amount Amount Non-adsorbent Adhered by Adhered by TotalEvaluation of Packaging Bag Fastener Tape Layer Fastener Non-adsorbentAmount Appearance of Non-adsorbency Non-adsorbency Tape Layer AdsorbedCollapsed Fastener Tape (mg/100 cm²) (mg/100 cm²) (mg) (mg) (mg) PortionOpenability (Absence of — 0.02 — 0.060 0.060 — — Fastener Tape) Ex. 10.03 0.02 0.004 0.057 0.061 good good Ex. 2 0.09 0.02 0.012 0.057 0.069good good Ex. 3 0.16 0.02 0.020 0.057 0.078 good good Ex. 4 0.57 0.020.074 0.057 0.131 bad good Ex. 5 0.10 0.02 0.013 0.057 0.071 good goodEx. 6 0.17 0.02 0.022 0.057 0.079 good good Ex. 7 0.13 0.02 0.017 0.0570.074 good good Ex. 8 0.22 0.02 0.029 0.057 0.086 good good Comp. Ex. 10.02 0.02 0.003 0.057 0.060 good bad Comp. Ex. 2 0.20 0.02 0.026 0.0570.083 good bad Comp. Ex. 3 14.3 0.02 1.859 0.057 1.916 good good

It can be understood from Table 2 that, in the case of having used theresin composition of Comparative Example 3, which does not have adequatenon-adsorbency, even if a packaging bag is used that has non-adsorbency,adequate non-adsorbency is unable to be obtained for the packaging bagwith fastener tape overall.

In contrast, in can be understood that, in the case of having usedanother resin composition having adequate non-adsorbency, when apackaging bag is used that has non-adsorbency, adequate non-adsorbencyis obtained for the packaging bag with fastener tape overall.

REFERENCE SIGNS LIST

-   -   10 First strip-like member    -   12 Engageable portion    -   20 Second strip-like member    -   22 Engageable portion    -   100 Fastener tape    -   200 Non-adsorbent layer of packaging bag film    -   250 Sealing portion    -   300 Packaging bag

1. A fastener tape comprised of first and second strip-like members that can be mutually engaged; wherein the first and second strip-like members are composed with a resin composition containing an ethylene-vinyl alcohol copolymer and an acid-modified polyolefin-based resin.
 2. The fastener tape according to claim 1, wherein the resin composition contains 65-95 mass % of an ethylene-vinyl alcohol copolymer and 5-35 mass % of an acid-modified polyolefin-based resin.
 3. The fastener tape according to claim 1, wherein the content of ethylene monomer unit in the ethylene-vinyl alcohol copolymer is 10-70 mol % based on the total number of moles of the ethylene monomer unit and vinyl alcohol monomer unit in the entire ethylene-vinyl alcohol copolymer.
 4. The fastener tape according to claim 1, wherein the melt mass flow rate of the resin composition as determined in compliance with JIS K7210-1 is 1.0 g/10 min or more under conditions of a temperature of 260° C. and load of 21.18 N.
 5. The fastener tape according to claim 1, wherein when the resin composition is molded into a film, cut to a size of 10 cm×10 cm, one surface is exposed for one week to L-menthol vapor in an environment at 40° C., the adsorbed L-menthol is extracted with methyl ethyl ketone, and the amount of L-menthol in the extract is quantified by gas chromatography, the adsorbed amount of L-menthol in the film is 0.7 mg or less.
 6. A packaging bag with fastener tape provided with: a packaging bag composed with a packaging bag film provided with a non-adsorbent layer, containing an ethylene-vinyl alcohol copolymer, for the innermost layer, and the fastener tape according to claim 1 fused to the non-adsorbent layer so that the first and second strip-like members are mutually opposing.
 7. A method for producing a packaging bag with fastener tape using: a fastener tape comprised of first and second strip-like members that can be mutually engaged, wherein the first and second strip-like members are composed with a resin composition containing an ethylene-vinyl alcohol copolymer and an acid-modified polyolefin-based resin, and a packaging bag film provided with a non-adsorbent layer containing an ethylene-vinyl alcohol copolymer, the method including: fusing the fastener tape to the non-adsorbent layer, and fusing the ends of the non-adsorbent layer by mutually opposing to form a bag such that the first and second strip-like members of the fastener tape are mutually opposing; wherein, when forming a bag by fusing the ends of the non-adsorbent layer by mutually opposing, at least a portion of the fastener tape is integrally fused and collapsed together with the ends of the non-adsorbent layer between the mutually opposing ends of the non-adsorbent layer. 